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Stocks & Investing 2025-03-20

Investing With a Long Time Horizon

The mental models I use when thinking about markets, compounding and where to put long-term capital.

I’m not a financial adviser. These are the frameworks I use personally — built from reading, experience and a lot of mistakes.

The most important variable

Time horizon. Nearly everything else flows from this.

If your horizon is genuinely long — ten years or more — most of the questions that feel urgent (is now a good time to buy? what if it drops?) become much less important. The signal-to-noise ratio of short-term market commentary is extremely low. Most of it is not worth reading.

What I’ve found actually useful

Thinking about businesses, not prices. The price of a share is interesting. The quality of the underlying business is more interesting. A business that compounds its intrinsic value over time will eventually be reflected in the price — and you’ll capture that even if you bought at a moderately high price.

Concentration vs diversification. The conventional wisdom says diversify. The more interesting case is that excessive diversification dilutes your best ideas down to average. I prefer a smaller number of higher-conviction positions I understand well over a large spread I can’t monitor properly.

The boring middle. Index funds are right for most people most of the time. Not because they’re exciting, but because they compound silently and don’t require you to be smarter than the market. The case for individual stock selection is only worth making if you’re genuinely willing to put in the work.

What I try to avoid

  • Checking prices daily
  • Reading analyst price targets
  • Making decisions based on macroeconomic forecasts
  • Selling good businesses because of short-term noise

Where I’m currently thinking

AI infrastructure, healthcare technology and energy transition. Not as a prediction — as areas where I believe there’s a reasonable case for sustained long-term value creation. I hold views loosely and update when the evidence changes.


None of this is advice. Do your own thinking.

JFJ
Jari Friis Joergensen
Founder, Sammetric · friisjoergensen.com